Overview Principal Software Engineer - Up to £270k - Series A Scale-Up - Python, AWS
I’m working on a really interesting platform scaling hire for a fast-growing Series A AI/fintech company in London.
They’ve built a product that processes millions of sensitive financial documents for lenders, brokers, insurers and fintechs across the US and UK. The platform is already mission-critical for customers — but rapid growth means the backend now needs to evolve from “built for speed” to “built for scale.”
This role will work closely with the CTO and Head of Engineering and take real ownership of the core backend systems.
Responsibilities Designing backend abstractions so a small engineering team can ship quickly and safely
Scaling multi-tenant infrastructure across enterprise customers with different security and SLA requirements
Supporting high-throughput document processing and ML pipelines
Strengthening security, reliability and compliance around sensitive financial data
Scaling systems from millions → tens of millions of documents
~8+ years building and scaling backend systems
Strong Python + cloud infrastructure experience
Experience working with large volumes of regulated or sensitive data
Hands-on IC mindset — someone who enjoys architecting and building
A strong background in Computer Science, with a university degree from a top ranked Global University is essential
Role Details Principal Software Engineer - Up to £270k - Series A Scale-Up - Python, AWS
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